The following is an alphabetical listing of all command line options, as generated by the compiler:
Free Pascal Compiler version 3.2.2+dfsg-32 [2024/01/05] for x86_64
Copyright (c) 1993-2021 by Florian Klaempfl and others
/usr/lib/x86_64-linux-gnu/fpc/3.2.2/ppcx64 [options] <inputfile> [options]
Put + after a boolean switch option to enable it, - to disable it.
@<x> Read compiler options from <x> in addition to the default fpc.cfg
-a The compiler does not delete the generated assembler file
-a5 Don't generate Big Obj COFF files for GNU Binutils older than 2.25 (Windows, NativeNT)
-al List sourcecode lines in assembler file
-an List node info in assembler file (-dEXTDEBUG compiler)
-ao Add an extra option to external assembler call (ignored for internal)
-ap Use pipes instead of creating temporary assembler files
-ar List register allocation/release info in assembler file
-at List temp allocation/release info in assembler file
-A<x> Output format:
-Adefault Use default assembler
-Aas Assemble using GNU AS
-Agas Assemble using GNU GAS
-Agas-darwin Assemble darwin Mach-O64 using GNU GAS
-Amasm Win64 object file using ml64 (Microsoft)
-Apecoff PE-COFF (Win64) using internal writer
-Aelf ELF (Linux-64bit) using internal writer
-Ayasm Assemble using Yasm (experimental)
-Anasm Assemble using Nasm (experimental)
-Anasmwin64 Assemble Win64 object file using Nasm (experimental)
-Anasmelf Assemble Linux-64bit object file using Nasm (experimental)
-Anasmdarwin Assemble darwin macho64 object file using Nasm (experimental)
-b Generate browser info
-bl Generate local symbol info
-B Build all modules
-C<x> Code generation options:
-C3 Turn on ieee error checking for constants
-Ca<x> Select ABI; see fpc -i or fpc -ia for possible values
-Cb Generate code for a big-endian variant of the target architecture
-Cc<x> Set default calling convention to <x>
-CD Create also dynamic library (not supported)
-Ce Compilation with emulated floating point opcodes
-Cf<x> Select fpu instruction set to use; see fpc -i or fpc -if for possible values
-CF<x> Minimal floating point constant precision (default, 32, 64)
-Cg Generate PIC code
-Ch<n>[,m] <n> bytes min heap size (between 1023 and 67107840) and optionally [m] max heap size
-Ci IO-checking
-Cn Omit linking stage
-Co Check overflow of integer operations
-CO Check for possible overflow of integer operations
-Cp<x> Select instruction set; see fpc -i or fpc -ic for possible values
-CP<x>=<y> packing settings
-CPPACKSET=<y> <y> set allocation: 0, 1 or DEFAULT or NORMAL, 2, 4 and 8
-CPPACKENUM=<y> <y> enum packing: 0, 1, 2 and 4 or DEFAULT or NORMAL
-CPPACKRECORD=<y> <y> record packing: 0 or DEFAULT or NORMAL, 1, 2, 4, 8, 16 and 32
-Cr Range checking
-CR Verify object method call validity
-Cs<n> Set stack checking size to <n>
-Ct Stack checking (for testing only, see manual)
-CT<x> Target-specific code generation options
-CTcld Emit a CLD instruction before using the x86 string instructions
-CX Create also smartlinked library
-d<x> Defines the symbol <x>
-D Generate a DEF file
-Dd<x> Set description to <x>
-Dv<x> Set DLL version to <x>
-e<x> Set path to executable
-E Same as -Cn
-fPIC Same as -Cg
-F<x> Set file names and paths:
-Fa<x>[,y] (for a program) load units <x> and [y] before uses is parsed
-Fc<x> Set input codepage to <x>
-FC<x> Set RC compiler binary name to <x>
-Fd Disable the compiler's internal directory cache
-FD<x> Set the directory where to search for compiler utilities
-Fe<x> Redirect error output to <x>
-Ff<x> Add <x> to framework path (Darwin only)
-FE<x> Set exe/unit output path to <x>
-Fi<x> Add <x> to include path
-Fl<x> Add <x> to library path
-FL<x> Use <x> as dynamic linker
-Fm<x> Load unicode conversion table from <x>.txt in the compiler dir
-FM<x> Set the directory where to search for unicode binary files
-FN<x> Add <x> to list of default unit scopes (namespaces)
-Fo<x> Add <x> to object path
-Fr<x> Load error message file <x>
-FR<x> Set resource (.res) linker to <x>
-Fu<x> Add <x> to unit path
-FU<x> Set unit output path to <x>, overrides -FE
-FW<x> Store generated whole-program optimization feedback in <x>
-Fw<x> Load previously stored whole-program optimization feedback from <x>
-g Generate debug information (default format for target)
-gc Generate checks for pointers (experimental, only available on some targets, might generate false positive)
-gh Use heaptrace unit (for memory leak/corruption debugging)
-gl Use line info unit (show more info with backtraces)
-gm Generate Microsoft CodeView debug information (experimental)
-go<x> Set debug information options
-godwarfsets Enable DWARF 'set' type debug information (breaks gdb < 6.5)
-gostabsabsincludes Store absolute/full include file paths in Stabs
-godwarfmethodclassprefix Prefix method names in DWARF with class name
-godwarfcpp Simulate C++ debug information in DWARF
-godwarfomflinnum Generate line number information in OMF LINNUM records in MS LINK format in addition to the DWARF debug information (Open Watcom Debugger/Linker compatibility)
-gp Preserve case in stabs symbol names
-gs Generate Stabs debug information
-gt Trash local variables (to detect uninitialized uses; multiple 't' changes the trashing value)
-gv Generates programs traceable with Valgrind
-gw Generate DWARFv2 debug information (same as -gw2)
-gw2 Generate DWARFv2 debug information
-gw3 Generate DWARFv3 debug information
-gw4 Generate DWARFv4 debug information (experimental)
-i Information
-iD Return compiler date
-iSO Return compiler OS
-iSP Return compiler host processor
-iTO Return target OS
-iTP Return target processor
-iV Return short compiler version
-iW Return full compiler version
-ia Return list of supported ABI targets
-ic Return list of supported CPU instruction sets
-if Return list of supported FPU instruction sets
-ii Return list of supported inline assembler modes
-io Return list of supported optimizations
-ir Return list of recognized compiler and RTL features
-it Return list of supported targets
-iu Return list of supported microcontroller types
-iw Return list of supported whole program optimizations
-I<x> Add <x> to include path
-k<x> Pass <x> to the linker
-l Write logo
-M<x> Set language mode to <x>
-Mfpc Free Pascal dialect (default)
-Mobjfpc FPC mode with Object Pascal support
-Mdelphi Delphi 7 compatibility mode
-Mtp TP/BP 7.0 compatibility mode
-Mmacpas Macintosh Pascal dialects compatibility mode
-Miso ISO 7185 mode
-Mextendedpascal ISO 10206 mode
-Mdelphiunicode Delphi 2009 and later compatibility mode
-n Do not read the default config files
-o<x> Change the name of the executable produced to <x>
-O<x> Optimizations:
-O- Disable optimizations
-O1 Level 1 optimizations (quick and debugger friendly)
-O2 Level 2 optimizations (-O1 + quick optimizations)
-O3 Level 3 optimizations (-O2 + slow optimizations)
-O4 Level 4 optimizations (-O3 + optimizations which might have unexpected side effects)
-Oa<x>=<y> Set alignment
-Oo[NO]<x> Enable or disable optimizations; see fpc -i or fpc -io for possible values
-Op<x> Set target cpu for optimizing; see fpc -i or fpc -ic for possible values
-OW<x> Generate whole-program optimization feedback for optimization <x>; see fpc -i or fpc -iw for possible values
-Ow<x> Perform whole-program optimization <x>; see fpc -i or fpc -iw for possible values
-Os Optimize for size rather than speed
-pg Generate profile code for gprof (defines FPC_PROFILE)
-R<x> Assembler reading style:
-Rdefault Use default assembler for target
-Ratt Read AT&T style assembler
-Rintel Read Intel style assembler
-S<x> Syntax options:
-S2 Same as -Mobjfpc
-Sc Support operators like C (*=,+=,/= and -=)
-Sa Turn on assertions
-Sd Same as -Mdelphi
-Se<x> Error options. <x> is a combination of the following:
<n> : Compiler halts after the <n> errors (default is 1)
w : Compiler also halts after warnings
n : Compiler also halts after notes
h : Compiler also halts after hints
-Sf Enable certain features in compiler and RTL; see fpc -i or fpc -ir for possible values)
-Sg Enable LABEL and GOTO (default in -Mtp and -Mdelphi)
-Sh Use reference counted strings (ansistring by default) instead of shortstrings
-Si Turn on inlining of procedures/functions declared as "inline"
-Sj Allows typed constants to be writeable (default in all modes)
-Sk Load fpcylix unit
-SI<x> Set interface style to <x>
-SIcom COM compatible interface (default)
-SIcorba CORBA compatible interface
-Sm Support macros like C (global)
-So Same as -Mtp
-Sr Transparent file names in ISO mode
-Ss Constructor name must be init (destructor must be done)
-Sv Support vector processing (use CPU vector extensions if available)
-Sx Enable exception keywords (default in Delphi/ObjFPC modes)
-Sy @<pointer> returns a typed pointer, same as $T+
-s Do not call assembler and linker
-sh Generate script to link on host
-st Generate script to link on target
-sr Skip register allocation phase (use with -alr)
-T<x> Target operating system:
-Taros AROS
-Tdarwin Darwin/Mac OS X
-Tdragonfly DragonFly BSD
-Tembedded Embedded
-Tfreebsd FreeBSD
-Tiphonesim iPhoneSimulator
-Tlinux Linux
-Tnetbsd NetBSD
-Topenbsd OpenBSD
-Tsolaris Solaris
-Twin64 Win64 (64 bit Windows systems)
-u<x> Undefines the symbol <x>
-U Unit options:
-Un Do not check where the unit name matches the file name
-Ur Generate release unit files (never automatically recompiled)
-Us Compile a system unit
-v<x> Be verbose. <x> is a combination of the following letters:
e : Show errors (default) 0 : Show nothing (except errors)
w : Show warnings u : Show unit info
n : Show notes t : Show tried/used files
h : Show hints c : Show conditionals
i : Show general info d : Show debug info
l : Show linenumbers r : Rhide/GCC compatibility mode
s : Show time stamps q : Show message numbers
a : Show everything x : Show info about invoked tools
b : Write file names messages p : Write tree.log with parse tree
with full path v : Write fpcdebug.txt with
z : Write output to stderr lots of debugging info
m<x>,<y> : Do not show messages numbered <x> and <y>
-W<x> Target-specific options (targets)
-WA Specify native type application (Windows)
-Wb Create a bundle instead of a library (Darwin)
-WB Create a relocatable image (Windows)
-WB<x> Set image base to <x> (Windows)
-WC Specify console type application (Windows)
-WD Use DEFFILE to export functions of DLL or EXE (Windows)
-We Use external resources (Darwin)
-WG Specify graphic type application (Windows)
-Wi Use internal resources (Darwin)
-WI Turn on/off the usage of import sections (Windows)
-WM<x> Minimum Mac OS X deployment version: 10.4, 10.5.1, ... (Darwin)
-WN Do not generate relocation code, needed for debugging (Windows)
-WP<x> Minimum iOS deployment version: 8.0, 8.0.2, ... (iphonesim)
-WR Generate relocation code (Windows)
-WX Enable executable stack (Linux)
-X Executable options:
-X9 Generate linkerscript for GNU Binutils ld older than version 2.19.1 (Linux)
-Xc Pass --shared/-dynamic to the linker (BeOS, Darwin, FreeBSD, Linux)
-Xd Do not search default library path (sometimes required for cross-compiling when not using -XR)
-Xe Use external linker
-Xf Substitute pthread library name for linking (BSD)
-Xg Create debuginfo in a separate file and add a debuglink section to executable
-XD Try to link units dynamically (defines FPC_LINK_DYNAMIC)
-Xi Use internal linker
-XLA Define library substitutions for linking
-XLO Define order of library linking
-XLD Exclude default order of standard libraries
-Xm Generate link map
-XM<x> Set the name of the 'main' program routine (default is 'main')
-Xn Use target system native linker instead of GNU ld (Solaris, AIX)
-XP<x> Prepend the binutils names with the prefix <x>
-Xr<x> Set the linker's rlink-path to <x> (needed for cross compile, see the ld manual for more information) (BeOS, Linux)
-XR<x> Prepend <x> to all linker search paths (BeOS, Darwin, FreeBSD, Linux, Mac OS, Solaris)
-Xs Strip all symbols from executable
-XS Try to link units statically (default, defines FPC_LINK_STATIC)
-Xt Link with static libraries (-static is passed to linker)
-Xv Generate table for Virtual Entry calls
-XV Use VLink as external linker (default on Amiga, MorphOS)
-XX Try to smartlink units (defines FPC_LINK_SMART)
-? Show this help
-h Shows this help without waiting